Electric push rod stroke control device

Abstract

The utility model provides an electric push rod stroke control device which comprises a motor base, a shell, a motor, a lead screw, a fine adjustment assembly and a push rod, the shell is fixedly arranged on the motor base, the motor is arranged on the motor base and located in the shell, the lead screw is arranged on the motor base, the lead screw is in power connection with the motor, and the fine adjustment assembly is arranged on the shell. The outer circle face of the lead screw is sleeved with a movable table, and the movable table is in threaded connection with the outer circle face of the lead screw. According to the scheme, the push rod is pushed to the limit position in advance through elastic force, rotation of the lead screw is not affected, movement of the push rod is prevented from being limited when the stroke exceeds the limit, and the situation that when the push rod runs to the two ends of the stroke, the lead screw is blocked, and a motor is overloaded or even burnt is avoided. Therefore, the safety of the electric push rod stroke control device in the using process is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric control equipment, in particular to an electric push rod stroke control device. Background Art

[0002] In existing automatic control devices, electric push rods are widely used as reciprocating push-pull actuators in the fields of automatic window opening, automobile electric doors, medical equipment, etc. Common electric push rods are mostly driven by motors, and the screw rod and nut spiral transmission drives the piston rod to achieve push and pull movements.

[0003] However, the existing electric push rods limit the movement of the push rods when the stroke exceeds the limit by means of brake pads, but the motor is still energized in this way, so the push rod motor will be blocked when the push rod runs to the two ends of the stroke, which may easily burn the motor and also fail to meet the user's requirements for a specific stroke. Utility Model Content

[0004] 1. Technical issues to be resolved

[0005] In view of the deficiencies in the prior art, the utility model provides an electric push rod stroke control device, which solves the problems raised in the above background technology.

[0006] (II) Technical solution

[0007] To achieve the above objectives, the utility model is implemented through the following technical solutions: an electric push rod stroke control device, comprising a motor base, a shell, a motor, a screw, a fine-tuning assembly and a push rod, the shell being fixedly arranged on the motor base, the motor being arranged on the motor base and located in the shell, the screw being arranged on the motor base, the screw being dynamically connected to the motor, a moving platform being sleeved on the outer cylindrical surface of the screw, the moving platform being threadedly connected to the outer cylindrical surface of the screw, a limit rod being fixedly arranged on the motor base, the limit rod passing through the moving platform, the push rod being slidably connected to the shell, a cavity being opened in the push rod, the push rod being sleeved on the screw rod through the cavity, and the fine-tuning assembly being arranged between the push rod and the moving platform.

[0008] Preferably, the annular array of limit rods is arranged on the motor base, and the moving platform is slidably connected to the limit rods.

[0009] Preferably, a boss is provided on the movable platform, and a supporting groove is provided in the boss.

[0010] Preferably, the fine-tuning assembly includes a support rod, a support seat and an elastic member, an adjustment cavity is opened in the push rod, the position of the adjustment cavity corresponds to the support groove, the support rod is slidably arranged in the adjustment cavity, one end of the support rod extends into the adjustment cavity, an electromagnet is fixedly provided in the adjustment cavity, the elastic member is arranged between the electromagnet and one end of the support rod, the other end of the support rod extends into the support groove, and the support groove is fixedly provided at the other end of the support seat.

[0011] Preferably, the support groove matches the shape of the support seat.

[0012] Preferably, the elastic member is a supporting spring.

[0013] (III) Beneficial effects

[0014] The utility model provides an electric push rod stroke control device, which has the following beneficial effects:

[0015] 1. This solution uses elastic force to push the push rod to the limit position in advance without affecting the rotation of the lead screw, thereby preventing the movement of the push rod from being restricted when the stroke exceeds the limit, and preventing the lead screw from being blocked when the push rod runs to the two ends of the stroke, causing the motor to overload or even burn out, thereby improving the safety of the electric push rod stroke control device during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the main structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the main structure of the utility model;

[0018] Figure 3 for Figure 2 Schematic diagram of the enlarged structure at point A in the middle.

[0019] In the figure: 11, motor seat; 12, motor; 13, screw; 14, moving platform; 15, limit rod; 16, push rod; 17, cavity; 20, adjustment cavity; 21, electromagnet; 22, support rod; 23, support seat; 24, support groove; 25, support spring. DETAILED DESCRIPTION

[0020] The utility model provides an electric push rod stroke control device, such as Figure 1-3As shown, it includes a motor base 11, a shell, a motor 12, a screw 13, a fine-tuning assembly and a push rod 16. The shell is fixedly arranged on the motor base 11, the motor 12 is arranged on the motor base 11 and is located in the shell, the screw 13 is arranged on the motor base 11, the screw 13 is dynamically connected to the motor 12, the motor 12 and the screw 13 are the same as the prior art structure, a moving platform 14 is sleeved on the outer cylindrical surface of the screw 13, the moving platform 14 is threadedly connected to the outer cylindrical surface of the screw 13, a limiting rod 15 is fixedly arranged on the motor base 11, the limiting rod 15 passes through the moving platform 14, the push rod 16 is slidably connected to the shell, a cavity 17 is opened in the push rod 16, the push rod 16 is sleeved on the screw 13 through the cavity 17, the fine-tuning assembly is arranged between the push rod 16 and the moving platform 14, and the fine-tuning assembly includes a support rod 22, a support base 23 and an elastic member.

[0021] like Figure 2 As shown, the limiting rods 15 are arranged in a circular array on the motor base 11, and the moving platform 14 is slidably connected to the limiting rods 15.

[0022] The movable platform 14 is provided with a boss, and a supporting groove 24 is formed in the boss.

[0023] like Figure 3 As shown, an adjusting cavity 20 is opened in the push rod 16, and the position of the adjusting cavity 20 corresponds to the supporting groove 24. The supporting rod 22 is slidably arranged in the adjusting cavity 20, and one end of the supporting rod 22 extends into the adjusting cavity 20. An electromagnet 21 is fixedly arranged in the adjusting cavity 20. The magnetism of the electromagnet 21 and the supporting rod 22 is opposite, and they are adsorbed by magnetic force. An elastic member is arranged between the electromagnet 21 and one end of the supporting rod 22. The other end of the supporting rod 22 extends into the supporting groove 24, and the supporting groove 24 is fixedly arranged at the other end of the supporting seat 23.

[0024] The supporting groove 24 matches the supporting seat 23 in shape, and the supporting seat 23 is located in the supporting groove 24 and fixed to the moving platform 14 via screws.

[0025] The elastic member is a supporting spring 25 .

[0026] When the motor 12 drives the screw rod 13 to rotate, the screw rod 13 drives the movable platform 14 to move axially through the outer cylindrical thread. At the same time, the electromagnet 21 is energized, and the electromagnet 21 attracts the support rod 22 through magnetic force and compresses the support spring 25. At this time, the movable platform 14 drives the push rod 16 to move synchronously through the support rod 22 to push the rod.

[0027] When the moving platform 14 drives the push rod 16 to move axially to the limit positions on both sides, that is, when the push rod 16 is less than ten pitches of the lead screw 13 from the limit position, the electromagnet 21 is de-energized. At this time, the support spring 25 pushes the push rod 16 to the limit position through elastic force without affecting the rotation of the lead screw 13, thereby preventing the movement of the push rod from being restricted when the stroke exceeds the limit. Since the motor 12 is still powered on at this time, the push rod 16 will cause the lead screw 13 to stall when it runs to the two end positions of the stroke, causing the motor 12 to overload or even burn out, thereby improving the safety of the electric push rod stroke control device during use.

[0028] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An electric push rod stroke control device, characterized in that: The invention comprises a motor seat (11), a housing, a motor (12), a screw rod (13), a fine adjustment component and a push rod (16), wherein the housing is fixedly arranged on the motor seat (11), the motor (12) is arranged on the motor seat (11) and is located in the housing, the screw rod (13) is arranged on the motor seat (11), the screw rod (13) is dynamically connected to the motor (12), a moving platform (14) is sleeved on the outer circumferential surface of the screw rod (13), and the moving platform (14) The motor base (11) is threadedly connected to the outer cylindrical surface of the screw rod (13); a limit rod (15) is fixedly provided on the motor base (11); the limit rod (15) passes through the movable platform (14); the push rod (16) is slidably connected to the housing; a cavity (17) is provided in the push rod (16); the push rod (16) is sleeved on the screw rod (13) through the cavity (17); and the fine-tuning assembly is arranged between the push rod (16) and the movable platform (14).

2. The electric push rod stroke control device according to claim 1, characterized in that: The limiting rods (15) are arranged in a ring array on the motor seat (11), and the moving platform (14) is slidably connected to the limiting rods (15).

3. The electric push rod stroke control device according to claim 1, characterized in that: The movable platform (14) is provided with a boss, and a supporting groove (24) is provided in the boss.

4. The electric push rod stroke control device according to claim 3, characterized in that: The fine-tuning assembly comprises a support rod (22), a support seat (23) and an elastic member; an adjusting cavity (20) is provided in the push rod (16); the position of the adjusting cavity (20) corresponds to the supporting groove (24); the support rod (22) is slidably arranged in the adjusting cavity (20); one end of the support rod (22) extends into the adjusting cavity (20); an electromagnet (21) is fixedly arranged in the adjusting cavity (20); the elastic member is arranged between the electromagnet (21) and one end of the support rod (22); the other end of the support rod (22) extends into the supporting groove (24); and the other end of the supporting seat (23) is fixedly provided with the supporting groove (24).

5. The electric push rod stroke control device according to claim 4, characterized in that: The support groove (24) matches the support seat (23) in shape.

6. The electric push rod stroke control device according to claim 4, characterized in that: The elastic member is a supporting spring (25).

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